Fusible links in vehicles are expected to protect
major feeders of a distribution system against
hard faults . . . generally experienced only during
major disassembly of the vehicle. By hard fault,
were talking many times hundreds to thousands of
amps supplied by a battery . . . not the soft
fault precipitated by a failing appliance.

Fusible links in vehicles are expected to protect
major feeders of a distribution system against
hard faults . . . generally experienced only during
major disassembly of the vehicle. By hard fault,
were talking many times hundreds to thousands of
amps supplied by a battery . . . not the soft
fault precipitated by a failing appliance.

The link protects the 12awg from the battery, in case of a hard fault on that line. (Think about faults under the cowl, where you'd never see/smell them in operation.)The feed to the main bus is protected from the battery by the master contactor, with the expectation that the pilot would detect the fault and manually turn off the master. Common FAA-accepted practice in certified planes.
On Tue, May 8, 2018 at 9:52 AM, William Daniell <wdaniell.longport(at)gmail.com (wdaniell.longport(at)gmail.com)> wrote:

Quote:

So continuing this theme on z16 can you explain why the alt has a 16 awg fuse link and the buss doesnt?

Fusible links in vehicles are expected to protect
major feeders of a distribution system against
hard faults . . . generally experienced only during
major disassembly of the vehicle. By hard fault,
were talking many times hundreds to thousands of
amps supplied by a battery . . . not the soft
fault precipitated by a failing appliance.

The link protects the 12awg from the battery, in case of a hard fault on that line. (Think about faults under the cowl, where you'd never see/smell them in operation.)The feed to the main bus is protected from the battery by the master contactor, with the expectation that the pilot would detect the fault and manually turn off the master. Common FAA-accepted practice in certified planes.
On Tue, May 8, 2018 at 9:52 AM, William Daniell <wdaniell.longport(at)gmail.com (wdaniell.longport(at)gmail.com)> wrote:

Quote:

So continuing this theme on z16 can you explain why the alt has a 16 awg fuse link and the buss doesnt?

Fusible links in vehicles are expected to protect
major feeders of a distribution system against
hard faults . . . generally experienced only during
major disassembly of the vehicle. By hard fault,
were talking many times hundreds to thousands of
amps supplied by a battery . . . not the soft
fault precipitated by a failing appliance.

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